Try-square.



. M. COUGHLIN.

TRY-SQUARE.

APPLICATION FILED MAY 5, 1914.

COLUMBIA PLANOGRAPH 0., WASHINGTON, D. c.

MICHA L ooUen nv, on PHILADELPHIA, PENNSYLVANIA.

TRY-SQUARE.

Specification of'Lettrs Patent. Pat nted Aug '31;1915;{

Application; filed May15n1914. Serial No. 836,398.

T 0 all whomait may concern Beiti-knownthat I, Mronnnn'Gooel-inrn, a citizeni of the UnitedxStates, residing l ght- Philadelphia, in the county .of Philadelplna and State of Pennsylvania, have invented J certain new useful Improvements; inl

Try-Squares, of which the followingw-isa specification- The object of the invention 1s, t0-pr0vrde .a

square with means forwadjustment. whereby, whenthe 'square is found to beaout of true,'. it may be reset .to theproper angle. The:

invention may a bea-app.lied -to= instruments, other than squares, for gagingrangle's.

Referring .to the accompanyingtrdrawing,

forming a part of this specificationand:

wherein like characters .of reference designate corresponding. parts throughout: the.

severalviews: Figure .1 is a .view in side elevation of a square, with parts broken away and shown in section to reveal underlying parts, Fig. 2 is a I. sectional view. taken through Fig. 1 on the line 22, Fig. 3 is a side elevation of a portionof: the-blade re moved, Fig. 4 is a detail view of the upper end of the head, with one of the furcations removed, and Fig. 5 is a view in end elevation of the square.

In the drawing, reference character 1 designates the blade and 2 the head which are designed to have a predetermined angular relation, and are both preferably constructed of metal. The head 2 is provided at its upper end with furcations 3 and 4 terminating in shoulder 5 where they join the body portion proper of the head 2. When the blade is in place in the head, it fitting between the two furcations 8 and 4, the lower edge of said blade is spaced from said shoulder 5 to permit of the desired adjustment of the blade.

The blade is provided with an opening 6 which, when the square is assembled alines with openings 7 and 8 in the furcations 3 and 4 respectively, said openings 6, 7 and 8 constituting a tapered aperture for the reception of a taper-pin 9upon which, the blade pivots in the head in accomplishing the hereinafter described adjustment. The end of the blade is provided with a socket or cut-out portion 10 to receive and against the end wall of which bears an adjusting screw 11, and the lower corner of the same end of the blade is cut-out to afford a somewhat. similar socket-12 to ireceiven-and against the-;end wall ofmwhich bears 'anadjusting:

screwd4.j The-furcation 3 is: provided inzits interior-face. with upper and lower-thread.

ed half sockets 15 and 16 respectively,while the. 1 furcationl 14 has, similan sockets, -15.- and 6. andthe adjustingscrewvll threadsinto. the halfv sockets .15. and 15 while the s21djllSting screw 14 threads-into the half. sockets 16 and .16.", the, said screws being locatedwithin.

the channell7,lsee F ig.':5, between the furcations?) and 4.. Itwillbe.observedthat the. adjusting; screws andlthe pivot pin .9 bear. a triangular. relation, withg, the adjusting screws above and below the. line-aof pivot ofthe blade, and that: these screws and pin are asfan removed fromeach other-as possible. to afford the greatest amount of leveragexfor" the. purpose of adj ustment;

Whenzthe bladezl hasbeen inserted zbe i tweentheqfurcationsi3:and 4 and the taperpin inserted, the upper adjusting screw. 11 is inserted and set until the blade 1 and head 2 conform-to the angleofanother true squareemployed as a templet, and then the lower adjusting screw 14 is inserted and set, whereupon the square will, be found to be true if the one employed as a templet is true. By the same means, 2'. e. the adjusting screws, the square may be varied from the normal angle, or if the blade or head become bent, they may again be restored to their normal angular relation by manipulation of the adjusting screws, it being understood that the said screws bearing against the end walls of the sockets 10 and 12 cause a swinging of the blade upon the taper pin 9 as a pivot.

To look the parts in their adjusted position, a set screw 20 is provided, and the stem thereof threads into a threaded socket 21 in the furcation 4, the aperture 22 provided in the furcation 3 being unthreaded, as well as the countersink 24 for the head of said screw 20. This set screw passes through an aperture 25 in the blade, said aperture being larger than the diameter of the threaded stem of the set screw 20 to permit limited swinging of the blade upon its pivot pin 9 during adjustment thereof by the adjusting screws 11 and 12. When the set screw 20 turbance of the efiected adjustment. In ad-. dition to the furcations pinchingthe blade, they likewise pinch the adjusting screws 11 and 1 k effectually locking the same against displacement.

Obviously, the head and blade may be.

separated to occupy less space in the tool chest or pocket, and for convenience in shipping.

What is claimed: 1. A square, comprising a blade, a head having fur-cations, means pivoting the blade between and to the furcations, and adjusting screws threaded in and located between the furcations to vary the angular relation of the blade and head. i

2. A square, comprising a separable blade and head, the head having furcations and their. adjacent faces provided with complementary threaded half-sockets, adjusting screws in said sockets and engaged with the same edge of the blade to vary the angular relation of the blade and head, and a pivotal connection between the head and blade.

A square, comprising a separable blade and head, the head having furcations and their adjacent faces provided with complementary threaded half sockets, adjusting screwsthreaded in said sockets and located between the furcations and engaged with the same edge of the blade to vary the angular relation between the blade and head, and a pivotal connection between the blade and head located at a point intermediate the adjusting screws.

4. A square, comprising a blade and head, the head being bifurcated to provide spaced furcations at the upper end thereof, a taperpin connecting the blade and head pivotally between the furcations, the head end of the blade having cut-0ut portions to one side and above and below the pivotal point, adjusting screws in said cut-out portions and having opposite side portions threaded in fractional sockets formed in opposite portions of adjacent walls of the furcations, said screws being axially parallel, and a set screw threaded in one furcation and passing through the other and the blade for drawing the furcations together to pinch the blade and adjusting screws. I

5. A square, comprising a blade and head pivotally connected, adjusting screws for swinging the blade in opposite directions upon its pivotal connection, and fur-cations on the head between which the blade is mounted, and means for clamping the fur cations upon said blade and upon the adjusting screws to prevent displacement thereof.

In testimony whereof I afiix my signature in presence of two witnesses.

MICHAEL COUGHLIN.

Witnesses:

WVARD GILHAM,

THOMAS S. LANARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

